/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.android.accessibility.utils;

/** An abstract base class for lockable data containers. */
public abstract class ReadOnly {
  private boolean mIsWritable = true;

  public boolean isWritable() {
    return mIsWritable;
  }

  public void setReadOnly() {
    mIsWritable = false;
  }

  protected void checkIsWritable() {
    if (!mIsWritable) {
      throw new IllegalStateException("Attempting to write a read-only object.");
    }
  }
}
